JEE Advanced 2022 Chemistry question

The correct option(s) related to adsorption processes is(are)

(A)Chemisorption results in a unimolecular layer.Correct
(B)The enthalpy change during physisorption is in the range of 100 to 140 kJ mol.
(C)Chemisorption is an endothermic process.
(D)Lowering the temperature favors physisorption processes.Correct

Answer: (A),(D)

Solution

(A) Chemisorption involves chemical bond formation with surface sites, so it stops at a monolayer – correct. (B) The enthalpy of physisorption is small, about 20–40 kJ mol (the 80–240 kJ mol range belongs to

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Question ID VK-033999